Self-Contained Hydraulic Thruster With Offset Lower Units
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Solution Overview
Problem
Current marine thrusters face issues such as interference between the lower unit and helm platform during retraction and tilting, inadequate hydraulic fluid flow due to the reservoir's location, and insufficient propulsion power from single lower units, hindering storage, transportation, and maintenance.
Innovation Solution
A self-contained hydraulic thruster design with an elevated hydraulic fluid reservoir and laterally offset lower units, allowing for full retraction and tilting without interference, improved hydraulic fluid flow, and increased propulsion power through multiple lower units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lower unit is retracted and tilted backwards for storage or maintenance, then the lower unit can be positioned for servicing, but the protruding upper end of the lower unit interferes with the helm and helm platform, preventing full upward tilting
Solution Approach 1:
The lower unit is laterally offset from the central axis of the vessel, moving it to a different spatial dimension. This lateral displacement allows the lower unit to clear the helm platform when tilted upward, enabling full tilting range without interference while maintaining effective propulsion position when extended
2Device complexity
If the hydraulic fluid reservoir is disposed on the base of the marine thruster, then the structure is simplified, but the reservoir is incapable of supplying enough fluid head to self-prime the power pack and facilitate hydraulic fluid flow
Solution Approach 1:
The hydraulic reservoir is elevated to a higher vertical position, creating a gravitational potential difference that enables hydraulic fluid to flow to the power pack without requiring additional pumping. This elevation provides sufficient fluid head for self-priming and continuous operation, while the reservoir remains integrated with the thruster assembly
3Device complexity
If a single lower unit propeller is used, then the device complexity is reduced, but the propeller does not supply enough power to adequately propel the vessel
Solution Approach 1:
The propulsion system is divided into multiple independent lower units, each with its own propeller. This segmentation allows the total propulsion power to be distributed across multiple units, providing adequate power for vessel propulsion while maintaining modular architecture that simplifies individual unit design and maintenance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient stowing and transportation, complete tilting for cleaning, reduced corrosion, and enhanced retraction of the lower units, while ensuring self-priming of the power pack and increased propulsion power, all while being economical to build using readily available components.
Implementation Method 1
the hydraulic fluid reservoir is elevated a substantial height above the level of the base upon which the power pack is mounted... facilitated hydraulic fluid flow from the hydraulic fluid reservoir to the hydraulic power pack
Data Source
AI summary
A self-contained hydraulic thruster for vessel. A power pack is mounted on a forward end of a base, and a helm platform is mounted on an aft end of the base at a substantial height above the base. A reservoir in communication with the power pack is mounted on the helm platform, thus facilitating hydraulic fluid flow from the reservoir to the power pack, and also rendering the hydraulic system self-priming. At least one lower unit is tiltably mounted to the base aft end, laterally offset from the helm platform. Due to the lateral offset between the lower unit(s) and the helm platform, interference between the lower unit(s) and the helm platform is avoided when the lower unit(s) is retracted and tilted up for transportation, storage, or maintenance.